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Applications of Anaerobic Digestion Technology in Wastewater Treatment

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Wastewater Treatment and Reuse".

Deadline for manuscript submissions: 20 July 2025 | Viewed by 893

Special Issue Editor


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Guest Editor
Chemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of Leon, 24071 Leon, Spain
Interests: bioprocesses; anaerobic digestion; wastewater treatment; waste; energy; recovery; circular economy; sustainability
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Special Issue Information

Dear Colleagues,

This Special Issue will focus on the latest advancements in anaerobic digestion (AD) for wastewater treatment. It aims to explore innovative methodologies and technological enhancements that improve the efficiency, adaptability, and sustainability of AD processes. This Special Issue will cover innovative AD processes, effective pre-treatment techniques, supplementation strategies to boost performance, and the integration of AD into other biological systems to enhance treatment efficiency and energy use. It will also include real-world applications, technical improvements, and case studies demonstrating the practical benefits and challenges of AD technology.

The purpose of this Special Issue is to disseminate recent advancements and innovative approaches in AD technology to researchers, engineers, and practitioners in wastewater treatment. By promoting knowledge sharing and stimulating further research, we aim to facilitate the adoption of advanced AD technologies to address the increasing volume and complexity of modern wastewater.

This Special Issue will address the emerging demand for more adaptable and efficient AD processes, and the challenges faced. It will highlight technological enhancements, interdisciplinary approaches, and practical applications, providing significant contributions to the field by filling in current research gaps and promoting advanced AD technology in wastewater treatment.

Prof. Dr. Elia Judith Martínez Torres
Guest Editor

Manuscript Submission Information

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Keywords

  • anaerobic digestion
  • wastewater treatment
  • pre-treatment strategies
  • biological system integration
  • energy production
  • biogas production
  • technological advancements

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Published Papers (1 paper)

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Research

16 pages, 3269 KiB  
Article
Optimization of an HRT-Fixed Plug-Flow Anaerobic-Oxic-Anoxic (AOA) Reactor: Changing the Specific Anaerobic/Oxic/Anoxic HRT Ratios
by Hao Zheng, Yuange Zheng, Ruitao Gao, Yunjie Jiang, Jiaxiang Nie, Mingyu Zhao, Lingna Xu, Ji Zhao, Yanling Qiu and Xiaoxia Wang
Water 2025, 17(5), 714; https://doi.org/10.3390/w17050714 - 28 Feb 2025
Viewed by 393
Abstract
Anaerobic-Oxic-Anoxic (AOA) is a promising process that addresses the increasingly stringent requirements for advanced nitrogen (N) and phosphorus (P) removal in wastewater treatment plants (WWTPs). Plug-flow AOA systems have received much attention due to the similarity of their application scenarios to those of [...] Read more.
Anaerobic-Oxic-Anoxic (AOA) is a promising process that addresses the increasingly stringent requirements for advanced nitrogen (N) and phosphorus (P) removal in wastewater treatment plants (WWTPs). Plug-flow AOA systems have received much attention due to the similarity of their application scenarios to those of WWTPs; however, the understanding of the AOA process remains incomplete. In this study, a plug-flow AOA reactor was operated for 142 days under different A/O/A hydraulic retention time (HRT) ratios at a short HRT (13.3 h). Efficient nutrient removal performance was achieved at an A/O/A HRT ratio of 1:2:2, with total inorganic nitrogen (TIN), P, and chemical oxygen demand (COD) removal efficiencies of 78.3 ± 5.5%, 96.0 ± 3.7%, and 79.8 ± 4.9%, respectively. Predominant functional bacteria, including Candidatus_Competibacter (2.1%) and Defluviicoccus (8.0%), as typical glycogen accumulating organisms (GAOs) contributed to good endogenous denitrification (approximately 37% TIN removal). Additionally, the reasonable A/O/A HRT ratio ensured synergistic interactions among multiple functional bacteria, enabling the stable operation of the efficient and cost-effective AOA system. Full article
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